Air freshener and preparation method thereof

Abstract

The present invention relates to a kind of air freshener and preparation method thereof, relate to the technical field of daily chemical products.The air freshener comprises: 0.05-10 parts of deodorant, 0.05-20 parts of plant-derived insect repellent, 0.1-5 parts of plant-derived fungicide, 0.05-5 parts of emulsifier, 0.05-2 parts of anticorrosive agent, 30-90 parts of water, 1.5-65 parts of propellant; the deodorant is ricinoleic acid zinc ester; the plant-derived insect repellent comprises at least one of the following raw materials: lemon eucalyptus oil, citronella oil, melaleuca oil, peppermint oil, geranium oil, cornus oil, lemongrass oil; the plant-derived fungicide comprises at least one of the following raw materials: cinnamon extract, grapefruit extract.The air freshener has the multi-effect synergistic functions of repelling insects, deodorizing, sterilizing, removing formaldehyde and removing smoke odor, is suitable for a variety of work and life scenes, has a pleasant smell, multi-effect synergistic, effectively improves air quality, has strong practicality, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of daily chemicals, in particular to an air freshener and a preparation method thereof. Background Art

[0002] Along with the improvement of people's living standard, the quality of living environment also more and more becomes the emphasis that people pay close attention to, one without peculiar smell, without insect, without harmful substance, the work and living environment of fresh air, not only makes people's physical and mental pleasure, more conducive to health, therefore, people's concern to air freshener is also continuing to heat up.At present, though commercially available air freshener is of a great variety, mostly adopt chemical synthesis substances such as ether, essence, cover peculiar smell by distributing fragrance, rather than reacting and then eliminating peculiar smell with the gas that causes peculiar smell in the air, therefore can not really improve air quality, and some chemical substances are released into the air, more can cause secondary pollution to air, as triclosan.In addition, the composition contained in some air freshener, although reacted with some harmful substances to a certain extent, but also accompanied by some stimulation and toxic substances produce, as NH , HCOOH etc. when its reaction, the respiratory system of human body is injured, especially for some easily allergic or the people of allergic constitution more so, increase the probability that people suffer from respiratory disease. Summary of the Invention

[0003] In response to the above problems, the present invention provides an air freshener, which has the multi-functional synergistic functions of repelling insects, removing odors, removing bacteria, removing formaldehyde and removing smoke odors. The air freshener is suitable for a variety of work and life scenarios, has a pleasant smell, and has multi-functional synergistic effects, effectively improves the air quality, has strong practicality, and has broad application prospects.

[0004] In order to achieve the above object, the present invention provides an air freshener comprising the following raw materials in parts by weight:

[0005]

[0006] The deodorant is zinc ricinoleate;

[0007] The plant-based insect repellent comprises at least one of the following raw materials: lemon eucalyptus oil, citronella oil, melaleuca oil, peppermint oil, geranium oil, dogwood oil, and lemongrass oil;

[0008] The botanical fungicide comprises at least one of the following raw materials: cinnamon extract and grapefruit extract.

[0009] Using zinc ricinoleate as a deodorant allows the air freshener to react with odor-causing gases in the air, eliminating odors at their source and truly improving air quality. By combining the aforementioned botanical insect repellent and botanical fungicide with the deodorant, the air freshener of the present invention simultaneously possesses the multiple functions of insect repelling, deodorizing, sterilizing, removing formaldehyde, and removing smoke odors. Furthermore, the botanical insect repellent and botanical fungicide are derived from plants, making them safe and harmless to the human body. This air freshener is suitable for a variety of work and daily life scenarios, offering a pleasant aroma and synergistic effects that effectively improve air quality. It is highly practical and has broad application prospects.

[0010] In one embodiment, the plant-based insect repellent comprises lemon eucalyptus oil, melaleuca oil, and peppermint oil; the weight ratio of the lemon eucalyptus oil, the melaleuca oil, and the peppermint oil is 1:0.5:(1.3-1.7).

[0011] In one embodiment, the plant-based insect repellent comprises lemon eucalyptus oil and citronella oil; the weight ratio of the lemon eucalyptus oil to the citronella oil is 1.5:(2.3-2.7).

[0012] In one embodiment, the plant-based insect repellent comprises geranium oil and cornus oil; the weight ratio of the geranium oil to the cornus oil is 2:(2.0-2.4).

[0013] In one embodiment, the plant-based insect repellent includes lemon eucalyptus oil, melaleuca oil, and geranium oil; the weight ratio of the lemon eucalyptus oil, the melaleuca oil, and the geranium oil is 2:2:(0.5-1.5).

[0014] In one embodiment, the plant-based insect repellent includes geranium oil, cornus oil, and lemongrass oil; the weight ratio of the geranium oil, the cornus oil, and the lemongrass oil is 1:2:(1.5-2.5).

[0015] In one embodiment, the plant-based insect repellent includes citronella oil, melaleuca oil, and cornus oil; the weight ratio of the citronella oil, the melaleuca oil, and the cornus oil is 2:1.5:(0.5-1.5).

[0016] In one embodiment, the plant-based insect repellent comprises citronella oil, peppermint oil, and lemongrass oil; the weight ratio of the citronella oil, the peppermint oil, and the lemongrass oil is 1.5:2:(1-3).

[0017] In one embodiment, the propellant comprises at least one of the following raw materials: n-propane, n-butane, dimethyl ether, tetrachloroethane, nitrogen, carbon dioxide;

[0018] The emulsifier comprises at least one of the following raw materials: octadecyltrimethylammonium chloride, isopropyl alcohol, propylene glycol, Span 80, Tween 80;

[0019] The anticorrosive agent comprises at least one of the following raw materials: sodium benzoate and polypropyl oleate amine.

[0020] The present invention also provides a method for preparing the air freshener, comprising the following steps:

[0021] A deodorant, a botanical insect repellent, a botanical fungicide, an emulsifier, and an anticorrosive are mixed to obtain an oil phase component; the oil phase component is filled into a container, water is filled into the container, a propellant is injected, air in the container is exhausted, and the container is sealed to obtain an air freshener.

[0022] Zinc ricinoleate forms an irreversible chemical bond reaction with small organic molecules in the presence of water and oxygen. This is the deodorizing principle of zinc ricinoleate and also the difficulty in its stable coexistence after compounding with other compounds. Plant essential oils such as lemon eucalyptus oil, citronella oil, melaleuca alternifolia oil, peppermint oil, geranium oil, cornus officinalis oil, and lemongrass oil all contain small molecule organic volatiles such as aldehydes, ketones, and esters, and therefore are incompatible with zinc ricinoleate. The above-mentioned preparation method solves the problem of incompatibility by injecting a propellant into a container and simultaneously exhausting the air in the container, and finally sealing the container to form an oxygen-isolated environment inside the container. This allows zinc ricinoleate and other ingredients to coexist stably without reacting, thus solving the problem of incompatibility.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention discloses an air freshener and a preparation method thereof. The air freshener has the multi-functional synergistic functions of repelling insects, removing odors, removing bacteria, removing formaldehyde and removing smoke odors, is suitable for various work and life scenarios, has a pleasant smell, and has multi-functional synergistic effects, effectively improves air quality, has strong practicality, and has broad application prospects. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] definition:

[0028] Lemon eucalyptus oil: CAS No: 8000-48-4.

[0029] Citronella oil: CAS NO. 106-22-9.

[0030] Melaleuca alternifolia oil: CAS NO.8008-98-8.

[0031] Peppermint oil: CAS NO. 68917-18-0.

[0032] Geranium oil: CAS NO.8000-46-2.

[0033] Cornus officinalis oil: essential oil extracted from cornus officinalis.

[0034] Lemongrass oil: CAS NO.8007-02-1 or 8008-56-8.

[0035] Cinnamon extract: Extracted from the dried twigs or bark of the cinnamon plant, Cinnamon bark, a member of the Lauraceae family. It is typically a yellow or amber liquid with a distinctive aroma and a sweet and spicy taste. It is slightly soluble in water, soluble in ethanol and ether, but insoluble in petroleum ether.

[0036] Grapefruit extract: an extract obtained from the dried outer peel of mature or nearly mature grapefruit through processes such as alcohol extraction, extraction, chromatography, and crystallization.

[0037] Span 80: Also known as Span 80, it is a yellow oily liquid that can be dispersed in warm water and ethanol, and soluble in organic solvents such as propylene glycol, liquid paraffin, ethanol, methanol or ethyl acetate.

[0038] Tween 80: also known as polysorbate-80, is a non-ionic surfactant and emulsifier with a chemical formula of C 24 H 44 O6(C2H4O)n. Easily soluble in water, soluble in ethanol, vegetable oil, ethyl acetate, methanol, toluene, insoluble in mineral oil.

[0039] source:

[0040] Polypropylene glycol oleate amine (Guangzhou Tuoxin Chemical Technology Co., Ltd., brand: NIC-V)

[0041] Unless otherwise specified, the reagents, materials, and equipment used in this example are all commercially available; and the experimental methods, unless otherwise specified, are all conventional experimental methods in the art.

[0042] The raw materials and weight parts of various embodiments and comparative examples of the present invention are shown in the following table.

[0043] Table 1 Raw materials and weight parts of each example

[0044]

[0045]

[0046]

[0047] Example 1

[0048] An air freshener.

[0049] The preparation method of the air freshener comprises:

[0050] According to Table 1, the raw materials in this example were weighed and the deodorant, botanical insect repellent, botanical fungicide, emulsifier, and anticorrosive agent were mixed uniformly to obtain an oil phase component;

[0051] Filling the above oil phase components into metal packaging cans;

[0052] Weigh deionized water according to Table 1 and fill it into a metal packaging can;

[0053] Add valve seal;

[0054] injecting propellant;

[0055] Add a spray cap to make an air freshener.

[0056] The air freshener is an aerosol type air freshener.

[0057] Example 2

[0058] An air freshener.

[0059] The preparation method of the air freshener comprises:

[0060] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0061] Example 3

[0062] An air freshener.

[0063] The preparation method of the air freshener comprises:

[0064] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0065] Example 4

[0066] An air freshener.

[0067] The preparation method of the air freshener comprises:

[0068] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0069] Example 5

[0070] An air freshener.

[0071] The preparation method of the air freshener comprises:

[0072] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0073] Example 6

[0074] An air freshener.

[0075] The preparation method of the air freshener comprises:

[0076] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0077] Example 7

[0078] An air freshener.

[0079] The preparation method of the air freshener comprises:

[0080] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0081] Comparative Example 1

[0082] An air freshener.

[0083] The preparation method of the air freshener comprises:

[0084] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1. The air freshener prepared was a spray-type air freshener, not an aerosol-type air freshener.

[0085] Comparative Example 2

[0086] An air freshener.

[0087] The preparation method of the air freshener comprises:

[0088] The raw materials in this example were weighed according to Table 1, and the remaining steps were the same as in Example 1.

[0089] Comparative Example 3

[0090] Commercially available water-based air freshener aerosol 1.

[0091] Comparative Example 4

[0092] Commercially available water-based air freshener aerosol 2.

[0093] Experimental Example 1

[0094] Mosquito repellent effect test.

[0095] 1. Mosquito and housefly repellent effect test (triple cylinder method):

[0096] 1. Spray the product to be tested evenly on the inner wall of the cylinder, the inside of the cylinder cover and the raised rubber plug inside the cylinder cover on one side of the triple cylinder. The amount of liquid to be applied should be enough to cover the entire inner wall of the cylinder without leaving any water droplets. Generally, spray about 0.8g on the inner wall of one side of the cylinder, and about 0.2g on the inside of the cylinder cover and the raised rubber plug inside the cylinder cover (a total of 1.0g).

[0097] 2. After it has dried naturally (about 15 minutes), assemble the tubes into a triple tube.

[0098] 3. Place 60 test insects into the middle tube of the triple tube through the insect hole. Rotate the insect hole of the middle tube until it is close to the surface of the test platform. After the test insects are stable (no obvious flying phenomenon, about 20 minutes), slowly remove the partition and start timing.

[0099] 4. Count the number of houseflies at the blank end and the spray end every 10 minutes (excluding the test insects at the connecting plate of the two tubes). Record the number of houseflies at the blank end and the spray end at each time point of 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes within 60 minutes. Calculate the average repellency rate M within 60 minutes according to the following formula (2).

[0100] 5. During the test, a blank control group is set up. No medicine is applied to the left and right ends of the blank control group. If the difference in the number of test insects at the left and right ends of the blank control group is greater than 50% (calculated according to the following formula (3)), the test insects are greatly affected by light and the test is invalid.

[0101] Average repellency rate:

[0102]

[0103] Where:

[0104] M1……………………represents the average repellency rate.

[0105] c……………………represents the total number of blank test insects at 6 time points, in pieces.

[0106] d……………………represents the total number of test insects at the application end at 6 time points, in pieces.

[0107] Difference rate:

[0108]

[0109] Where:

[0110] N……………………represents the average difference rate.

[0111] e……………………represents the total number of test insects on the left end at the six time points, in pieces.

[0112] f……………………represents the total number of test insects on the right side at the six time points, in pieces.

[0113] 2. German cockroach repellent effect test (small square box method):

[0114] Test method:

[0115] 1. Spray the product solution to be tested evenly on one side of the storage box. The amount of liquid to be applied should be enough to cover the entire area, generally about 1.0g.

[0116] 2. After it has dried naturally, place 30 stunned German cockroach adults of uniform size in the middle test insect waiting area and start timing.

[0117] 3. Record the number of test insects at both ends and record the data at regular intervals (the knocked-down German cockroaches are counted in the blank end), test the cockroach repellency for 24 hours, and calculate the repellency rate (M2) according to the following formula (4).

[0118] Calculation method:

[0119]

[0120] Where:

[0121] M2……………………represents the average repellency rate.

[0122] g……………………represents the total number of German cockroaches at the blank end, in pieces.

[0123] h……………………represents the total number of German cockroaches at the application end, in pieces.

[0124] 3. Test results of insect repellent effect.

[0125] Table 2 Test results of the insect repellent effect of each embodiment and comparative example

[0126] Mosquito repellent rate Housefly repellency rate German cockroach repellency rate Example 1 82％ 92％ 92％ Example 2 85％ 91％ 100％ Example 3 90％ 88％ 95％ Example 4 91％ 78％ 100％ Example 5 88％ 85％ 100％ Example 6 86％ 90％ 98％ Example 7 85％ 92％ 95％ Comparative Example 1 87％ 82％ 100％ Comparative Example 2 22％ 26％ 15％ Comparative Example 3 21％ 23％ 32％ Comparative Example 4 22％ 26％ 15％

[0127] It can be seen from the test results in the above table that the difference between Comparative Example 2 and Example 7 is that Comparative Example 2 uses a single plant-based insect repellent, and the other ingredients are the same as those in Example 7. The insect repellent effect of Comparative Example 2 is worse than that of Example 7.

[0128] Experimental Example 2

[0129] Deodorization performance test (simulated experimental chamber method).

[0130] 1. Ammonia removal test method:

[0131] 1. First, clean and dry a 2500mL wide-mouth bottle, cover half of the bottle mouth with plastic wrap, cut a 2cmX5cm filter paper and tie one end with a rope, put it into the wide-mouth bottle, use a 50μL microinjector to transfer 10μL ammonia water (concentration 25%-28%) to the cut filter paper, and completely seal the bottle mouth with plastic wrap.

[0132] 2. After 4 hours, slowly pull out the rope, remove the filter paper (no need to remove the plastic wrap), use pointed tweezers to make a small hole in the plastic wrap, and use a pipette to transfer a certain amount (10 mL) of the experimental sample liquid phase to the bottle through the small hole. Seal the bottle with new plastic wrap and tie it with a rope. Inject the same amount of negative control solution (deionized water / or ethanol water solution) into the blank group bottle;

[0133] 3. After 24 hours, use an ammonia test tube to measure the ammonia concentration in the bottles of the experimental group and the blank group, and calculate the clearance rate according to the following formula (5). The calculation method of W1 is as follows:

[0134]

[0135] In the formula, W1……………………represents the clearance rate.

[0136] K1……………………represents the ammonia concentration of the blank group, the unit is mg / m 3 .

[0137] K2……………………represents the ammonia concentration of the experimental group, in mg / m 3 .

[0138] 2. Hydrogen sulfide removal test method:

[0139] 1. First, clean and dry a 250 mL Erlenmeyer flask, seal the bottle mouth with plastic wrap, use a 100 μL microinjector to transfer 300 μL of hydrosulfuric acid (1%) into the bottle, and then completely seal the bottle mouth with new plastic wrap.

[0140] 2. After 4 hours, a certain amount of experimental sample liquid (100 μL) was injected into the bottle using a microinjector, and the bottle was sealed with new plastic wrap and tied with a rope. The same amount of negative control solution was injected into the blank group bottle;

[0141] 3. After 24 hours, use a hydrogen sulfide test tube to measure the hydrogen sulfide concentration in the bottles of the experimental group and the blank group, and calculate the clearance rate W2 according to the following formula (6). Calculation method:

[0142]

[0143] In the formula: W2……………………represents the clearance rate.

[0144] K3……………………represents the hydrogen sulfide concentration of the blank group, in mg / m 3 .

[0145] K4……………………represents the hydrogen sulfide concentration of the experimental group, in mg / m 3 .

[0146] 3. Deodorization effect test results.

[0147] Table 3 Deodorization effect test results of each embodiment and comparative example

[0148] Ammonia removal rate Hydrogen sulfide removal rate Example 1 92％ 95％ Example 2 90％ 96％ Example 3 95％ 93％ Example 4 96％ 88％ Example 5 93％ 90％ Example 6 98％ 96％ Example 7 93％ 94％ Comparative Example 1 5％ 2％ Comparative Example 2 93％ 94％ Comparative Example 3 5％ 2％ Comparative Example 4 8％ 9％

[0149] It can be seen from the test results in the above table that the difference between Comparative Example 1 and Example 5 is that no propellant is added to the formula of Comparative Example 1, and the other ingredients are the same as those of Example 5. The deodorizing effect of Comparative Example 1 is worse than that of Example 1.

[0150] Experimental Example 3

[0151] Antibacterial performance test.

[0152] 1. Collection and culture of bacterial strains: First, place the sterile culture medium in the air to collect airborne colonies for a certain period of time. After culturing in a 37°C incubator for 48 hours, use an inoculation loop to pick the airborne colonies, refrigerated Staphylococcus aureus colonies, and refrigerated Escherichia coli colonies, and use the plate streak method to further collect and culture the target bacterial strains.

[0153] 2. Inoculation of control group culture medium: 30 bacterial strains were inoculated on each sterile culture medium using a homemade inoculation needle.

[0154] 3. Inoculation of experimental group culture medium:

[0155] 1. Use a pipette to take 0.1 mL (100 μL) of the liquid phase of the sample to be tested, spread it evenly on the surface of the sterile culture medium with a coating rod, and then use an inoculation needle to inoculate 30 strains of bacteria on each sterile culture medium.

[0156] 2. Cool the sterilized culture medium to about 50°C, take 2 mL of the liquid phase of the sample to be tested with a pipette, add it to 100 mL of culture medium, shake it evenly, turn it over and cool it until it solidifies, then use an inoculation needle to inoculate 30 strains of bacteria on each sterile culture medium.

[0157] 3. Negative control: No colony inoculation was performed.

[0158] 4. Culture test: Place the test group, control group and negative control group samples in an incubator and culture them at 37℃ for 48 hours. Count the colonies (the appearance of colonies in the negative control is considered a test failure) and calculate the inhibition rate (P) according to the following formula (1):

[0159]

[0160] Where:

[0161] P……………………represents the inhibition rate.

[0162] a……………………represents the number of colonies in the control group culture medium, in pieces.

[0163] b……………………represents the number of colonies in the culture medium of the experimental group, in pieces.

[0164] 4. Antibacterial performance test results.

[0165] Table 4 Antibacterial performance test results of each embodiment and comparative example

[0166] Antibacterial rate Example 1 100％ Example 2 100％ Example 3 100％ Example 4 100％ Example 5 100％ Example 6 99％ Example 7 100％ Comparative Example 1 98％ Comparative Example 2 99％ Comparative Example 3 0％ Comparative Example 4 5％

[0167] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0168] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An air freshener, characterized in that It is composed of the following raw materials in parts by weight: The deodorant is zinc ricinoleate; The plant-based insect repellent comprises at least one of the following raw materials: lemon eucalyptus oil, citronella oil, melaleuca oil, peppermint oil, geranium oil, dogwood oil, and lemongrass oil; The botanical fungicide comprises at least one of the following raw materials: cinnamon extract, grapefruit extract; The propellant comprises at least one of the following raw materials: n-propane, n-butane, dimethyl ether, tetrachloroethane, nitrogen, and carbon dioxide; The emulsifier comprises at least one of the following raw materials: octadecyltrimethylammonium chloride, isopropyl alcohol, propylene glycol, Span 80, Tween 80; The anticorrosive agent comprises at least one of the following raw materials: sodium benzoate, polypropyl oleate amine; The preparation method of the air freshener comprises the following steps: A deodorant, a botanical insect repellent, a botanical fungicide, an emulsifier, and an anticorrosive are mixed to obtain an oil phase component; the oil phase component is filled into a container, water is filled into the container, a propellant is injected, air in the container is exhausted, and the container is sealed to obtain an air freshener.

2. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises lemon eucalyptus oil, melaleuca oil, and peppermint oil; the weight ratio of the lemon eucalyptus oil, the melaleuca oil, and the peppermint oil is 1:0.5:(1.3-1.7).

3. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises lemon eucalyptus oil and citronella oil; the weight ratio of the lemon eucalyptus oil to the citronella oil is 1.5:(2.3-2.7).

4. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises geranium oil and cornus oil; the weight ratio of the geranium oil to the cornus oil is 2:(2.0-2.4).

5. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises lemon eucalyptus oil, melaleuca oil, and geranium oil; the weight ratio of the lemon eucalyptus oil, the melaleuca oil and the geranium oil is 2:2:(0.5-1.5).

6. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises geranium oil, cornus oil, and lemongrass oil; the weight ratio of the geranium oil, the cornus oil, and the lemongrass oil is 1:2:(1.5-2.5).

7. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises citronella oil, melaleuca oil, and cornus oil; the weight ratio of the citronella oil, the melaleuca oil and the cornus oil is 2:1.5:(0.5-1.5).

8. The air freshener according to claim 1, characterized in that The plant-based insect repellent comprises citronella oil, peppermint oil, and lemongrass oil; the weight ratio of the citronella oil, the peppermint oil, and the lemongrass oil is 1.5:2:(1-3).

9. The method for preparing the air freshener according to any one of claims 1 to 8, characterized in that: The following steps are involved: A deodorant, a botanical insect repellent, a botanical fungicide, an emulsifier, and an anticorrosive are mixed to obtain an oil phase component; the oil phase component is filled into a container, water is filled into the container, a propellant is injected, air in the container is exhausted, and the container is sealed to obtain an air freshener.

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